Pixel-Farbindex-Poster (Foto zu pixeliertem Farbblock-Poster)

Use one real photograph as the sole content source to create a vertical before-and-after comparison poster. The upper half fully preserves the real photographic texture, subject identity, quantity, pose, spatial relationships, lighting, and composition of the input photo, without turning the photo into an illustration; the lower half is a stylized re-rendering zone of the same photo: on a warm white paper surface, distill the image into four equally sized square pixel color block indexes, corresponding respectively to the most recognizable subject silhouette, architectural or object structure, primary color and light-shadow relationship, and one environmental detail from the photo. Each cell uses a limited color palette with hard-edged pixel blocks and a low-resolution grid feel, retaining traceable forms without random mosaicking. Arrange the four cells in a 2x2 grid, leaving ample paper margin around them; use thin black cross crop/registration marks to frame the index area, and add a very small amount of bilingual titles and fields, such as "COLOR INDEX / SCENE STUDY", with restrained, clear text like print proof annotations that do not overpower the design. The lower half must look like a designed color index card, not a filter, ordinary pixelation, or repeated photo; do not add unrelated objects or change the photo's subject. The upper and lower areas each occupy about half, with a clear horizontal boundary; side-by-side arrangement, multi-image collage, "original/AI image" corner labels, watermarks, and brand logos are prohibited. All colors are extracted and compressed from the input photo, and the content of the four cells varies with the photo subject, applicable to any photo including people, animals, architecture, street scenes, nature, interiors, food, and objects.